What is a cross connection?

A cross-connection is a link between a potable water system and a non-potable water system, in our case, the City of Alamogordo's public water lines and our customers’ private plumbing systems. Backflow can occur through cross-connections.

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1. I received a letter saying my annual backflow test is due. What do I need to do?
2. Why are backflow preventers tested annually?
3. Do Backflow Testers work for City of Alamogordo Utilities Department?
4. How do I know if I need to install a backflow preventer?
5. What is backflow?
6. What is a cross connection?
7. What causes backflow?
8. How does City of Alamogordo Water System prevent backflow?
9. What can I do to protect my home plumbing system from backflow?
10. What is the backflow administration fee?
11. A backflow preventer was already installed when I moved into this commercial space, but I don't think I need it. What should I do?
12. I'm a renter, why did I receive a letter about the backflow preventer?
13. I received a letter saying I need to install a backflow preventer. How do I do that?
14. Examples of common sources of cross connection hazards are listed below (this is not intended to be a complete list):